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booyakasha!

The feel the first time you grab the brakes is "wow!" They feel stronger and more linear/progressive than the stock Brembo 2-piston/2 pad. I probably need to get the pads to seat by riding more but nevertheless, it feels great!

I have the Alpina wheels which provide clearance for the usage of these Brembo goldline 4p/2p calipers and others. The rotor-to-hub spacing is exactly the same as the stock wheels, so, what's the difference? The Alpina spokes are more vertical instead of more "diagonal" arrangement of stock wheels, thus the caliper does not hit the spokes when installed. (It seems that one could possibly install this caliper when you have a stock spoke wheel but then you'd have to machine off the back of the caliper. That kinda looks scary to me because you're removing wall thickness from the caliper piston itself.)
2) A machinist to remove 4mm off the mounting bosses of the calipers.

Why? The goldline caliper installs nicely as-is, BUT the caliper is offset by 4mm. It's too close to the center hub of the wheel by 4mm. Machining the bosses off the caliper will move the caliper outboard by 4mm and the rotor will now pass through the centerline of the caliper perfectly.

Once you have machined down the mounting bosses by 4mm, the rest of the installation is a piece of cake.

The upgrade with photos:

THE CALPER (yucky, dirty, and greasy - needs love)

AFTER MACHINING (spot-face with smooth fillet radius)

CLEAN THEM UP PRETTY (with Simple Green)

INSTALL THE PADS

BOLT THEM ON

CHECK FOR CLEARANCES

ALL DONE!!!

BEFORE:______________ AFTER:

____

I forgot to mention the machinist's cost: 36-can case of Bud Light (x2)

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The Alpina spokes are more vertical instead of more "diagonal" arrangement of stock wheels, thus the caliper does not hit the spokes when installed. (It seems that one could possibly install this caliper when you have a stock spoke wheel but then you'd have to machine off the back of the caliper. That kinda looks scary to me because you're removing wall thickness from the caliper piston itself.)
2) A machinist to remove 4mm off the mounting bosses of the calipers.

Why? The goldline caliper installs nicely as-is, BUT the caliper is offset by 4mm. It's too close to the center hub of the wheel by 4mm. Machining the bosses off the caliper will move the caliper outboard by 4mm and the rotor will now pass through the centerline of the caliper perfectly.

Once you have machined down the mounting bosses by 4mm, the rest of the installation is a piece of cake.

Best post I have seen on this subject,, I recently had a track day and cooked my front standard brakes on the GT, I decided to put in new pads as I live on Mars I could not get ebc hh at the time, I was talked into another brand which has stainless heat shields on the piston side of the pads thus the pads were thicker by 2 pieces of stainless, both sides my thoughts it pushed the pistons further back putting more fluid into the already full reservoir thus causing the brakes to drag when it all heated up result cooked calipers soooo, I would be interested in doing the same BUT I will need to look at shaving off the back of the caliper (in picture) How much meat is there? will there be enough? a couple of tricky questions. has someone measured the wall thickness or can they, and finally how thick is thick enough?

Registered

By the way, please post about how they feel to you after they are bedded in and you have a feel for them. I absolutely love these calipers and think they are night and day vs. the stock setup.

Also, I'd love to get the contact info for your machinist because I will have a pair drop-shipped to him so I can use them with stock wheels on my GT, since I ran into a set of Paul Smart wheels I'm going to try on the GT and don't want to go back to stock calipers.

I'm also in CA and don't mind a little shipping cost to have your guy do it. I would rather have a guy who has done it before take a crack at it as opposed to talking some local guy through this and hoping it somehow turns out right.

Registered

I am going to be putting Alpina's on my bike in the spring. Can i ask if the brembo 4 piston/4 pad calipiers will fit on directly without any machining required???? with the standard fork & rotor set up.

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The "1st Generation" Alpinas are the same width as your stock wheels and are designed to bolt right up with all stock parts. They will require the same machining of the 4-pot calipers as aeolian has just shown us.

The "2nd Generation" Alpinas are narrower and have removable shims to place the rotors in the stock position. Without the shims, they would place your stock rotors in the correct location to align with the 4-pots.

Alpina - 2nd Generation
-Remove the 4mm spacer between the hub and the rotors. (I need confirmation on this but I think I'm correct. I used this post as reference and it worked for me.)
-Install the calipers (No machining required at all. Nowhere. Nice!)
-Use all existing hardware and bolt it up.
-Enjoy. Easier than 1st gen Alpinas.

Stock wheels (Open to the most problems but can be done - I wouldn't.)
-Machine the caliper mounting bosses by 4mm.
-Machine the backside of the calipers in a diagonal manner possibly breaching the brakepad piston cavity. Scary and no thanks.
-Use all existing hardware and bolt it up.
-Enjoy with apprehension.

Mag Wheels
Now, if you have mag wheels installed (like Marchesini or from ST4 or Monster, etc), then you will have all the clearance in the world for the backside of the calipers. All you have to worry about is the caliper-to-rotor alignment. (need confirmation) Probably just machining down the caliper mounting bosses by 4mm or make a new rotor-to-hub spacer.

I am going to make a leap of faith that the 4p/4p calipers will be exactly the same installation as the 4p/2p with the exception that:

1) You will need new/different hoses because of the way the end-fittings are bent.

2) You will need a larger flow/pressure Master Cylinder (like a radial master cylinder) because the the calipers will require more flow/pressure. I know some people have done it with the stock master cylinder but they have to use lots of brake lever-travel (or pump it a couple times) to accomplish the pressures needed for hard braking.

My opinion is to go for 4p2p Goldlines if you have Alpinas or mag wheels.

Registered

Mag Wheels
Now, if you have mag wheels installed (like Marchesini or from ST4 or Monster, etc), then you will have all the clearance in the world for the backside of the calipers. All you have to worry about is the caliper-to-rotor alignment. (need confirmation) Probably just machining down the caliper mounting bosses by 4mm or make a new rotor-to-hub spacer.

Nope, that situation is MUCH easier. With all the "mags" I know of, the goldlines will bolt up and work perfect. The mag wheels have narrower hubs so they present rotor/alignment issues with stock calipers, but they align perfectly with the Goldlines.

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